Surf for More Math
Lesson 4 - Area Rule for Rectangles
Use this interactive activity to encourage your child to have fun on the Web while learning about the area rule for rectangles.
Develop and explain a rule for calculating the area of a rectangle.
Student Book pages 228-229
Instructions for Use
Area of Rectangles and Squares helps your child relate the length and width of a rectangle to area.
To use Area of Rectangles and Squares, drag both blue buttons along the sliders to illustrate that changing the length and width of a rectangle, changes its area and perimeter.
Notice how the Web page uses the area rule for rectangles to calculate the area. Count the squares in the rectangle to see if the area is correct. Check many different rectangles to see if the rule is always correct.